PDF malware analysis — malicious · 58a5f9f242c2bb94

MALICIOUS

PDF

72.0 KB Created: 2021-06-09 07:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26

MD5: 257eebb940b8d8615984ada875c5939a SHA-1: 34ebd542f5007da4666677ae75bda1c755282ea8 SHA-256: 58a5f9f242c2bb94e0c964df350092cf5b9c0910165efcd123f80c390a4aba9b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user engagement for malicious purposes, likely to distribute further payloads or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://coretry.ru/uplcv?utm_term=class+11+computer+science+notes PDF link annotation
- https://bevelec.com/bevelec/dossierMois/file/dojuxuw.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9u1pgki46gmnr0tgd8do3vpcj3/gejet.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5eb0165fb5752c0a43de301a1fc1d583/43920362168.pdfIn PDF document text
- https://sport-jicin.cz/dokumenty/golokogifovoxajunadu.pdfIn PDF document text
- https://chmelo.hu/sites/default/files/file/fujinomifatuxovone.pdfIn PDF document text
- https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6391685cb3---ludojidonasi.pdfIn PDF document text
- https://alarrabnews.com/images/content/content/file/bubodiwulak.pdfIn PDF document text
- https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/130ef752b2e29e145546ec83dbf352d7/gedexok.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721177b7c07---fokewunufudebafusuzo.pdfIn PDF document text
- http://ecovn.vn/uploads/news_file/tanabozajudojoliwipunorup.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ff962218c24d6c75f156acceadbf843d/lipivezokexixivo.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef9c1302a---80067836724.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/07076aec29434e8ec107f0b547204b66/4773706503.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160864d4ddc0fe---76330179921.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/oltb2qgemjjcbf9udm0o7024h1/roburumuganabimifexi.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cdf6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDF6	5036 bytes
SHA-256: `837e4d86f639ee7ca5137c321df650b270f82783f9284ed46cd7c87af44e1c3e`
`font_01_sfnt_off0000defe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEFE	10840 bytes
SHA-256: `aed196e728d3afe4ebd4bf518dfa532da297a8236d9705d9b59693532b6ded75`
`font_02_sfnt_off00010429.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10429	16164 bytes
SHA-256: `e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6`

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